Describe the role of oceans in climate regulation and how human activity affects them.

• A. Oceans absorb heat and CO2, moderating climate.
• B. Oceans have no role in climate regulation.
• C. Human activity has no impact on ocean chemistry.
• D. Oceans never experience acidification.

Answer: (A)

Oceans regulate climate by storing heat and absorbing CO2, which moderates global and regional climate. Their high heat capacity means they can take up large amounts of solar energy with only modest temperature increases, and ocean currents then redistribute that heat around the globe, helping to dampen extreme temperatures and shape weather patterns. At the same time, seawater acts as a major sink for carbon dioxide from the atmosphere. When CO2 dissolves in seawater, it forms carbonic acid, lowering pH and reducing carbonate ions, which affects marine life and the chemical balance of ocean waters. Because human activities are increasing atmospheric CO2, more of it is absorbed by the oceans, leading to greater ocean warming and ongoing acidification. This combination of heat regulation and chemical buffering illustrates why the oceans are central to climate and how human actions are impacting their chemistry. The other statements contradict what we know: oceans do regulate climate, human activities do affect ocean chemistry, and ocean acidification is a real and ongoing process.